Introduction Our Medaka egg was sent from Clarion all the way to here. My partner and I had to take care of this little egg. Alyson and I named our fish Goliath because it was a cool but random name. We had to change our egg’s water every day so it would stay fresh. We could only use distilled (spring) water in the dish we kept him in. He had to stay in room temperature so that he wouldn’t croak.Goliath hatched on the seventh day, and on that day he was a free little fish. He swam around and around very fast. My partner and I got to take our fish egg home. Although the egg is hatched it needs fed with special food that Mrs. Maine had. Being that it was a hassle, Aly and I left Goliath there!
Day 14-7-11 We think our Medaka Fish is atstage 13 because if you look atthe lateral view in the JapaneseMadaka book, it looks similar tothe one shown. It may not be 13hours old yet, but it sure lookslike it. In this stage thedorsal fin gastrula has formed.A thin crease clearly marks thedorsal lip where involutionbegins. We did not take a videoon the first day.
Day 24-8-11 Our Medaka Fish is at stage 22because the Optic Lens andOtocyst has developed. We thinkthat it is 40 hours old. In thisstage the eyes are starting toform but they are very hard todetermine what they actuallyare. On the second day the heartwas beating 88 beats per minute.
Day 34-11-11 Our Medaka Fish is at stage25-26 because it is similar tothe one in the book. You can seebody movement and a lot oftwitching, but you can also seethe two black granules specklethe optic cup. (In another wordsthe eyes) On this day the heartwas beating 134 beats perminute.
Day 44-12-11 Our little Medaka fish as camealong way, and in stage 29 wesaw the urinary bladder form andalso some other fins, such asthe Caudal. The urinary bladderwasn’t a greenish tint but youcould still see the structure.On Day 4 the little guys heartbeat was 120 per minute.
Day 54-13-11 On stage 29-30 the veins arereally starting to show, and youcan see the tail more. In thisstage the urinary bladder wasgreen, and you could really seeit. The heartbeat was faint. Butthe most you could really seewas very detailed.
Day 64-14-11 Stage 33 is where our Medakafish is. A lot of his organshave developed, and the colorsare becoming more detailed. Butalso there is more movement thanusual.
Day 74-15-11Our little Goliath hatched onDay 7. He grew into a beautifulbaby.This picture he is at thestage of 36. In this stage theswim bladder has become aboutthe size of the oil globule. Theurinary bladder, spleen, andliver are located on the leftside.
Day 7Our little Goliath hatched onDay 7. He grew into a beautifulbaby.This picture he is at thestage of 36. In this stage theswim bladder has become aboutthe size of the oil globule. Theurinary bladder, spleen, andliver are located on the leftside.
Day 7This is the rear of Goliath, thecaudal fin.http://gottalovebio.wikispaces.com/Chelsea+E.Here is a video of him hatched!
ConclusionThis project taught us alot about embryology andit was neat to watch theegg change from day today.We learned how totake care of a fish andlearned what wasnecessary for it tolive.
Resourceshttp://en.wikipedia.org/wiki/Oryzias_latipeshttp://biol1.bio.nagoya-u.ac.jp:8000/http://gottalovebio.wikispaces.com/EmbryologyPictures taken by themicroscopes in school.